At the edge of the Haight / by Katherine Seligman.

"Maddy Donaldo, homeless at twenty, has made a family of sorts in the dangerous spaces of San Francisco's Golden Gate Park. She knows whom to trust, where to eat, when to move locations, and how to take care of her dog. It's the only home she has. When she unwittingly witnesses the murder of a young homeless boy and is seen by the perpetrator, her relatively stable life is upended. Suddenly, everyone from the police to the dead boys' parents want to talk to Maddy about what she saw. As adults pressure her to give up her secrets and reunite with her own family before she meets a similar fate, Maddy must decide whether she wants to stay lost or be found."--Provided by publisher.